I loved to figure out how to see the space around you to progress. It's not too difficult but tricky. You mostly have to look from a particular perspective to see a new area or turn gravity around to access a floor.
These mechanincs are pretty well thought out.

I didn't really get the ending or the overall meaning? A little bit underwhelming.

The length is fair (~25 mins).
Looking around the black & white rooms gets you a headache after a while.